Improvement in furnaces for steam-boilers



u. B. sTmLlNa. Furnaces for Steam-Boilers'.

N0. 144,296. Paiented Nov.4-,\873.`

Ailes, Inventov.

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AIJ'NITEIJ, STATES URIAII I3. sTnIBLINe, or MADIsoN, INDIANA.

PATENT CFIIon.

IMPRovEmEn-r'm FuRNAE-s Fon STEAM-eoliens.

Specification forming part of Letters Patent No. 114,296, dated November4, 1873; application filed December 19, 1872.

To all whom it may concern:

Be it known that I, URIAH B. Srnrnnve., of Madison, in the county ofJefferson and State of Indiana, have invented certain Improvements inFurnaces for Steam-Boilers, of which the following is a specification:

My invention relates to that class of furnaces in which a forced draftis used, and is intended as an improvement on the furnace patented by meMarch 28, 1871, and numbered 113,110. In this invention I make use of aplate provided with air-tubes and overlaid with fire-brick or tiles,said tubes projecting upward between the tiles.- This plate takes theplace usually occupied by the grate-hars, and forms a cover for a hotair chamber connected with the draft. Another feature of my invention isa pipe or system of pipes extending from the above-named hot-air chamberback under the boiler in the combustion chamber or space between theboiler and fire-bed, said pipes being connected at different points byhollow perforated castings, or their equivalents, by means of which hotoxygen is supplied to said combustion-chamber. Another Vfeature of myinvention is the device for drawing the carbonio acid and otherunconsumed gases from the uptake by means of an exhaust-fan, and forcingthem into the hot-air chamber or other airreservoir, where they aremixed with oxygen, and thence upon the burn-ing fuel in the furnace,where the carbonio acid combines with oxygen, is converted into carboniooxide, and rendered combustible.

Figure l is a longitudinal vertical section of the furnace on the planeof the line a: .r in Fig. 2. Fig. 2 is a plan of the same with the upperportion omitted.

Let A represent the combustion chamber or space under a boiler, B thespace over the flre, and O the refront. The boiler is not shown. D is ahot-air chamber, which also serves as an ash-box, and is provided withan air-tight The cover F of this chamber is the lire-bed, and ispreferably constructed of castiron, with conical tubes a a cast upon it,and projecting from its upper surface. These tubes may be inclinedtoward the Vrear of the furnace,` 'and they open into the chamber D. Toprotect the plate F from the action of the fire it may be overlaid withre=brick or tiles, or other re= fractory material, G, which should riseslightly above the tops of the tubes a a, so as to protect them. Thesetubes furnish the necessary air to the re, said air being -supplied totheA chamber D, through the pipes H, H, and I, from a blower connectedwith the lpipe I, but not shown. i

The pipes H H may be exposed to any desired degree of heat in thecombustion-chamber by leaving them uncovered; or they may be wholly orpartially covered with nre-clay or tiles. By exposing these pipes theoxygen in the air-chamber is heated and combustion accelerated. i

From the hot-air chamber D two or more pipes, c c, extend back to therear of the comi bustion-chamber, and are connected at the end and atintervals by hollow metallic cast= ings h h, perforated on the upperside. The obj ect of this device is to supplyr heated oxygen from thechamber D to the combustion chamber or space A, for the more perfect comwith an ordinary exhaust-fan, (not shown,) by

which the unconsumed gases are taken up and forced thence through thepipe (see Fig. 2) into the hotair chamber Dwhere they are mixed withoxygen and pass into the furnace,

thus effectually consuming all that is combustible.

If preferred, the gases from the uptake may be forced into a reservoirand mixed with oxygen before entering the chamber D.

It will be seen, by reference to the plan in Fig. 2, that the pipes H Hcurve inward at the rear of the furnace, and connect with theblower-pipe I.

In applying this furnace to steamboat-boih ers, where a curved metallicback is used to turn the smoke and gases from the combustion-chamberinto the rear end of the iiues, I propose to use a curved hollow ironback, into which the pipe I will enter from the outside, and the pipes HH from the inside, the hollow pipe thus connecting the three. I

Having thus described my invention, vwhat I claim as new, and desire tosecure by Letters Patent, is

1. The combination of a close perforated firebed, F, and a close hot-airchamber, D,- which receives a blast of air through a heated pipe orpipes, H E, substantially .as herein specified. 2. The combination, Withthe close hot-blastsupplying chamber D, of hotairsupplying pipes c c andhollow perforated castings h h in the combustion-chamber A,substantially as herein specified.

3. In combination with the hot-air chamber' D, pipes H, H, and I, plateF, and tubes a a, the device consisting of the system of pipes L and M,valve z', and an ordinary exhaust-fan, when arranged substantially inthe manner shown, and for the purposes set forth.

v URIAH. B. STRIBLING.

Witnesses: JOHN Corri,-

E. C. BARBOUR. i

